全文获取类型
收费全文 | 301438篇 |
免费 | 25538篇 |
国内免费 | 12898篇 |
专业分类
化学 | 188343篇 |
晶体学 | 3402篇 |
力学 | 15392篇 |
综合类 | 673篇 |
数学 | 34907篇 |
物理学 | 97157篇 |
出版年
2022年 | 3089篇 |
2021年 | 4925篇 |
2020年 | 6830篇 |
2019年 | 8181篇 |
2018年 | 7734篇 |
2017年 | 7259篇 |
2016年 | 11740篇 |
2015年 | 9455篇 |
2014年 | 12225篇 |
2013年 | 17902篇 |
2012年 | 16965篇 |
2011年 | 17707篇 |
2010年 | 14453篇 |
2009年 | 14295篇 |
2008年 | 14840篇 |
2007年 | 13617篇 |
2006年 | 12255篇 |
2005年 | 10850篇 |
2004年 | 9545篇 |
2003年 | 8024篇 |
2002年 | 7300篇 |
2001年 | 7532篇 |
2000年 | 5771篇 |
1999年 | 4708篇 |
1998年 | 4196篇 |
1997年 | 3894篇 |
1996年 | 3631篇 |
1995年 | 3356篇 |
1994年 | 3209篇 |
1993年 | 2980篇 |
1992年 | 2925篇 |
1991年 | 3114篇 |
1990年 | 2912篇 |
1989年 | 2841篇 |
1988年 | 2605篇 |
1987年 | 2604篇 |
1986年 | 2427篇 |
1985年 | 2888篇 |
1984年 | 2815篇 |
1983年 | 2439篇 |
1982年 | 2472篇 |
1981年 | 2331篇 |
1979年 | 2385篇 |
1978年 | 2549篇 |
1977年 | 2639篇 |
1976年 | 2727篇 |
1975年 | 2540篇 |
1974年 | 2461篇 |
1973年 | 2642篇 |
1972年 | 2142篇 |
排序方式: 共有10000条查询结果,搜索用时 109 毫秒
1.
Mayboroda I. O. Kolobkova E. M. Grishchenko Yu. V. Chernykh I. A. Zanaveskin M. L. Chumakov N. K. 《Crystallography Reports》2021,66(3):520-524
Crystallography Reports - The formation of β-Si3N4 for subsequent growth of AlGaN and GaN heterostructures of silicon wafers has been studied. It is established that the native oxide layer... 相似文献
2.
Khabensky V. B. Almjashev V. I. Granovsky V. S. Krushinov E. V. Vitol S. A. Kotova S. Yu. Gusarov V. V. 《Technical Physics》2021,66(2):221-228
Technical Physics - In the case of a severe accident at a nuclear power plant with light-water reactors, the most effective method for localization of the formed melt (corium) is its retention in... 相似文献
3.
Russian Physics Journal - The paper shows that the values of zero-point energy and vibrations of atoms in a crystal determined by the uncertainty principle, depend on the dynamic response of atoms.... 相似文献
4.
Breev I. D. Likhachev K. V. Yakovleva V. V. Veishtort I. P. Skomorokhov A. M. Nagalyuk S. S. Mokhov E. N. Astakhov G. V. Baranov P. G. Anisimov A. N. 《JETP Letters》2021,114(5):274-278
JETP Letters - The effect of static mechanical strain on the splitting of spin sublevels of color centers based on spin 3/2 silicon vacancies in silicon carbide at room temperature has been shown.... 相似文献
5.
Marija argonja Darko Mekterovi Paula
urga Jagoda Ravli‐Gulan Iva Bogdanovi Radovi Gordana
auhar 《X射线光谱测定》2021,50(1):68-79
During metal welding and cutting, large amounts of particulate matter (PM) are produced that might represent a significant health risk for the exposed workers. In the present pilot study, we performed an elemental analysis of fine PM collected in a metal workshop. Also, elemental analysis of the hair and nail samples collected from workers exposed to the workshop dust and control group was done. Concentrations of 15 elements in PM were measured with X‐Ray Fluorescence (XRF) and Particle Induced X‐ray Emission (PIXE), whereas inductively coupled plasma mass spectrometry (ICP‐MS) was used to determine 12 elements in hair and nail samples. Mean 8‐hr concentrations of PM2.5, Fe, and Mn in the vicinity of welders were up to 1803, 860, and 30 μg/m3, respectively, whereas in the nearby city, daily PM2.5 concentrations are on average 11 μg/m3. We found that several elements, especially Fe and Mn, had substantially higher concentrations in hair and nail samples of exposed workers than in the control group, which indicates the accumulation of metals in workers' tissues, although limit values were not exceeded. 相似文献
6.
JETP Letters - It is shown that the intrinsic magnetization of transition metal dichalcogenide monolayers calculated within the two-band model depends significantly on the boundary conditions on... 相似文献
7.
Annin B. D. Ostrosablin N. I. Ugryumov R. I. 《Journal of Applied Mechanics and Technical Physics》2021,62(5):709-716
Journal of Applied Mechanics and Technical Physics - The possibility of phase transitions (martensitic transformations) in shape-memory alloys is evaluated using the concept of eigenmoduli... 相似文献
8.
Chueshova A. G. Pavlova L. A. Peshcherova S. M. Nepomnyashchikh A. I. 《Crystallography Reports》2021,66(7):1206-1215
Crystallography Reports - The orientation of grains and the special boundaries formed by them in multicrystalline silicon has been studied by electron backscattered diffraction. It is found that... 相似文献
9.
Liu Jun-Wei Shen Shu-Qian Li Ming Li Lei 《International Journal of Theoretical Physics》2021,60(5):1712-1719
International Journal of Theoretical Physics - Quantum coherence, coming from quantum superposition, occupies a significant position in the field of physics. We put forward a lower bound of the... 相似文献
10.
Abramov B. M. Baznat M. Borodin Yu. A. Bulychjov S. A. Dukhovskoy I. A. Krutenkova A. P. Kulikov V. V. Martemianov M. A. Matsyuk M. A. Turdakina E. N. 《Physics of Atomic Nuclei》2021,84(4):467-474
Physics of Atomic Nuclei - In the FRAGM experiment at the heavy-ion accelerator $$-$$ accumulator complex ITEP $$-$$ TWA, yields of cumulative charged $$\pi$$ mesons have been measured in a... 相似文献